Chuck.



PATENTED OCT. 18, 1904. I

G. R. RICH. CHUCK. APPLICATION IILE D NOV. 28, 1902.

NO MODEL.

UNIT D. STATES Patented October18, 1904.

PATENT OFFICE.

GEORGE R. RIoi 'oF CHICAGO,ILLINOIS, AssIeNoR ro THE eno. R. RICH MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

CHUCK.

SPEbIFICATIONforming part of Letters Patent No. 772,534,, dated October 18, 1904.v

' To all whom it may concern:

Be it knownthat I, GEO GE R. RICH, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful'lmprovements in Chucks, of which the following: is a specification. I I I My inventlon relates to certain new and useful improvements in chucks; and its objectis to producea device'of this'class',which shall be cheaper than the devices of theelass here-- tofore in use, which shall operate as satisfactorily as doother devices in every respect, and which. in addition shall be much easier to the remaining parts being removed.- Fig. at

is a similars'ection of the bushing. Fig; 5 is a section in the line 55 of Fig. 2. Fig. 6 is a -sectionin the line 6 6 of Fig. 2. Fig. 7 is an end view of the drill-stop, and Fig. 8 is a perspective of one of the drill-clamping jaws.

Referring to the drawings, Aiis the main cylinder of the drill chuck, provided with an internal screw-thread a and'an externallythreaded shoulder a at its lower end. Within the drill-chuck is threaded a drill-stop B in the form of-a blockrwhich can be screwed or down in the interior of the cylinder.

11 The bloc-h is provided on its lower surface with a'plura'iity of grooves]; of such breadth as to fit the upper end of thedrill, so that the drill being held against rotation the block cannot be screwed one way or the other. .In

the top'of the cylinder isa head (J, provided. with a spindle adapted tobe centered and secured in a drill-press. The drill proper I drill tocenter the same.

3, Application ad November 28,1902.- SerialNo.133,004 (No-model.)

' (indicated by D) is in the form of a straight bar of uniform cross-section throughout its bluechip-steel, bars of whichrcan be obtained on the .market. The bars. are rounded on b .entirelength and is constructed, preferably, of

their edges at (land provided by grinding with suitable-cutting edges d at their lower ends. The drill proper is placed in the drillchuck with its upper end in one of the grooves Zrof the block B. A bushing E, circular in .form and of the same internal diameter as the greatest breadth of the drill, is slipped over the each to'each, are then placed in position.

frusto-conical segment f, a point f thereon, a portion f in the shape of a segment of a cylinder on the opposite sideof the frustoconical segment from the point, and a shoulder f Suitable notches a are provided in the wall of the main cylinder A and similar notches e in thewall of the bushing'E-to receive the shoulders f, where they will necessarily be held without rotation with respect to the cylinder A. This being done, the cap' G is screwed up over the end of the cylinder,

jaws, forcing them tightly into place, producing great pressure uponthe drillproper and wedging it firmly in place. hen the drill becomes dull for any reason, the cap G is loosened, the drill is pulled out, the block B- screwed down, the drill after grinding pushed Two jaws F, similar The shape of. these jaws is clearly shown in perspective in Fig. -8, each consisting of a in against it, and the cap re'tightened. Thedrill can then be used to the very end, the

dull and the stopbeing moved up to compensate for the wear. a

The advantages of my improved drill can be best set forth by having reference to certain of the types heretofore in use. The drill which heretofonehas been most used for rapid Work is a drill having a point'much like that shown herein, .but which is formed by flattening out'the end of a cylindrical rod. When, therefore, the point of the drill becomes worn point being merely reground as it becomes a beveled portion 9 thereon coming into contact with the frusto-conical portion f of thedown, as it of course does after being re- .sharpened a few times, all the flattened portion is used up, and it becomes necessary to reforge the entire drill, which of course necessitates retempering and makes it as expensive to sharpen a drill as to construct my new one. With my device, on the other hand, nothing of this sort has to be done, the fiat drill proper being merely fed forward as the point is worn down and no treatment but grinding is necessay to keep it sharpened. A further advantage consists in the fact that by using the drill proper of the same cross-Seetion throughout its length certain materials can be used in its construction which cannot be readily forged to form drills of the types heretofore in use. 7

As above mentioned, the internal diameter of the bushing E is that of the largest diameter of the drill and centers the same. The use of bushing enables different-sized drills to be used in connection with the chuck. When a drill of larger diameter is to be used, a bushing of "an equal internal diameter is selected and secured in place in the mouth of the cylindrical casing;

I realize that considerable changes can be made in the details of this construction, and I do not, therefore, desire to limit myself to the exact construction described.

' I claim as new and desire to secure by Letters Patent- 1. In a device of the class described, the

screw-threaded therein, said stop having a diametrical notch adapted to receive the end of a parallel-faced drill to center the same and being prevented by engagement therewith,

from rotation in the chuck. a pair of jaws and means for bringing them together upon the i drill.

2. In a device of the class described, the combination with a main cylinder. a rap thereon and a drill-stop movable therein, of a bushing adapted to surround and tightly lit 5 the drill to center the same, suitable jaws and means for bringing said jaws together upon i the drill.

3. In a device of the class described, the combination with a main cylinder, and a stop therein, of a bushing adapted to surround and center a drill. the bushing and main cylinder being suitably notched, of jaws provided with shoulders adapted to engage said notches to prevent relative rotation of the parts. and means for closing the jaws upon the drill to hold the same in place.

In witness whereof I have signed the above application for Letters Patent. at Chicago. in the county of Cook and State. of lllinois, this 18th day of November, A. l). 1902.

(iEORUEll. lil(ll.

i combination with a main cylinder, of a stop Witnesses: i CHAS. O. hni-lnvnr, ltussau. \NILI'ZS. 

